ill service vs disservice

ill service and disservice both are nouns.

Word	Noun	Adjective	Verb	Adverb
ill service	Yes	No	No	No
disservice	Yes	No	No	No

As nouns, ill service and disservice are synonyms defined as:

ill service and disservice: an act intended to help that turns out badly

Other synonyms of ill service include ill turn.

ill service (noun)	disservice (noun)
an act intended to help that turns out badly	an act intended to help that turns out badly